On the dynamics of the jovian ionosphere and thermosphere.

Details On the dynamics of the jovian ionosphere and thermosphere. On the dynamics of the jovian ionosphere and thermosphere.

Jan 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005icar..173..200m&link_type=abstract

Icarus, Volume 173, Issue 1, p. 200-211.

Physics

17

Aurora, Ionospheres, Atmosphere, Magnetosphere, Modelling

Scientific paper

We use the fully coupled, three-dimensional, global circulation Jovian Ionospheric Model (JIM) to calculate the coupling between ions in the jovian auroral ovals and the co-existing neutral atmosphere. The model shows that ions subject to drift motion around the auroral oval, as a result of the E×B coupling between a meridional, equatorward electric field and the jovian magnetic field, generate neutral winds in the planetary frame of reference. Unconstrained by the magnetic field, these neutral winds have a greater latitudinal extent than the corresponding ion drifts. Values of the coupling coefficient, k(h), are presented as a function of altitude and cross-auroral electric field strength, for different incoming electron fluxes and energies. The results show that, with ion velocities of several hundred metres per second to over 1 km s-1, k(h) can attain values greater than 0.5 at the ion production peak. This parameter is key to calculating the effective conductivities required to model magnetosphere-ionosphere coupling correctly. The extent to which angular momentum (and therefore energy) is transported vertically in JIM is much more limited than earlier, one-dimensional, studies have predicted.

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